U is for ... Undulations

We spent the morning shopping for garden storage to replace Mum's shed and greenhouse, which are due to be demolished (before they fall down!) Eventually we ended up on the Thameside at Erith with sandwiches, and I took the opportunity to take some shots of the mud flats and clouds.

We both agreed that the mudflats were undulating, and therefore a suitable subject for DDW's February 2014 Alphabet Challenge which has reached the letter U